[PATCH v5] drm/mediatek: Add AFBC support to Mediatek DRM driver
Justin Green
greenjustin at chromium.org
Wed Nov 16 19:33:35 UTC 2022
From: Justin Green <greenjustin at chromium.org>
Tested on MT8195 and confirmed both correct video output and improved DRAM
bandwidth performance.
v5:
* Removed some dead defines.
* Refactored mtk_ovl_set_afbc().
v4:
* Move modifier validation to format_mod_supported function.
* Add modifiers to drm_universal_plane_init() call.
* Make comparisons to DRM_FORMAT_MOD_LINEAR explicit rather than relying on
DRM_FORMAT_LINEAR being equal to 0.
* Gate AFBC control bit writes on device compatibility.
v3:
* Replaced pitch bitshift math with union based approach.
* Refactored overlay register writes to shared code between non-AFBC and
AFBC.
* Minor code cleanups.
v2:
* Marked mtk_ovl_set_afbc as static.
* Reflowed some lines to fit column limit.
Signed-off-by: Justin Green <greenjustin at chromium.org>
---
drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 57 +++++++++++++++++-
drivers/gpu/drm/mediatek/mtk_drm_plane.c | 74 +++++++++++++++++++++++-
drivers/gpu/drm/mediatek/mtk_drm_plane.h | 8 +++
3 files changed, 134 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 002b0f6cae1a..5a59e7b99c5d 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -29,17 +29,22 @@
#define DISP_REG_OVL_DATAPATH_CON 0x0024
#define OVL_LAYER_SMI_ID_EN BIT(0)
#define OVL_BGCLR_SEL_IN BIT(2)
+#define OVL_LAYER_AFBC_EN(n) BIT(4+n)
#define DISP_REG_OVL_ROI_BGCLR 0x0028
#define DISP_REG_OVL_SRC_CON 0x002c
#define DISP_REG_OVL_CON(n) (0x0030 + 0x20 * (n))
#define DISP_REG_OVL_SRC_SIZE(n) (0x0038 + 0x20 * (n))
#define DISP_REG_OVL_OFFSET(n) (0x003c + 0x20 * (n))
+#define DISP_REG_OVL_PITCH_MSB(n) (0x0040 + 0x20 * (n))
+#define OVL_PITCH_MSB_2ND_SUBBUF BIT(16)
#define DISP_REG_OVL_PITCH(n) (0x0044 + 0x20 * (n))
#define DISP_REG_OVL_RDMA_CTRL(n) (0x00c0 + 0x20 * (n))
#define DISP_REG_OVL_RDMA_GMC(n) (0x00c8 + 0x20 * (n))
#define DISP_REG_OVL_ADDR_MT2701 0x0040
#define DISP_REG_OVL_ADDR_MT8173 0x0f40
#define DISP_REG_OVL_ADDR(ovl, n) ((ovl)->data->addr + 0x20 * (n))
+#define DISP_REG_OVL_HDR_ADDR(ovl, n) ((ovl)->data->addr + 0x20 * (n) + 0x04)
+#define DISP_REG_OVL_HDR_PITCH(ovl, n) ((ovl)->data->addr + 0x20 * (n) + 0x08)
#define GMC_THRESHOLD_BITS 16
#define GMC_THRESHOLD_HIGH ((1 << GMC_THRESHOLD_BITS) / 4)
@@ -67,6 +72,7 @@ struct mtk_disp_ovl_data {
unsigned int layer_nr;
bool fmt_rgb565_is_0;
bool smi_id_en;
+ bool supports_afbc;
};
/*
@@ -172,7 +178,14 @@ void mtk_ovl_stop(struct device *dev)
reg = reg & ~OVL_LAYER_SMI_ID_EN;
writel_relaxed(reg, ovl->regs + DISP_REG_OVL_DATAPATH_CON);
}
+}
+static void mtk_ovl_set_afbc(struct mtk_disp_ovl *ovl, struct cmdq_pkt *cmdq_pkt,
+ int idx, bool enabled)
+{
+ mtk_ddp_write_mask(cmdq_pkt, enabled ? OVL_LAYER_AFBC_EN(idx) : 0,
+ &ovl->cmdq_reg, ovl->regs,
+ DISP_REG_OVL_DATAPATH_CON, OVL_LAYER_AFBC_EN(idx));
}
void mtk_ovl_config(struct device *dev, unsigned int w,
@@ -310,11 +323,23 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
struct mtk_plane_pending_state *pending = &state->pending;
unsigned int addr = pending->addr;
- unsigned int pitch = pending->pitch & 0xffff;
+ unsigned int hdr_addr = pending->hdr_addr;
+ unsigned int pitch = pending->pitch;
+ unsigned int hdr_pitch = pending->hdr_pitch;
unsigned int fmt = pending->format;
unsigned int offset = (pending->y << 16) | pending->x;
unsigned int src_size = (pending->height << 16) | pending->width;
unsigned int con;
+ bool is_afbc = pending->modifier != DRM_FORMAT_MOD_LINEAR;
+ union overlay_pitch {
+ struct split_pitch {
+ u16 lsb;
+ u16 msb;
+ } split_pitch;
+ u32 pitch;
+ } overlay_pitch;
+
+ overlay_pitch.pitch = pitch;
if (!pending->enable) {
mtk_ovl_layer_off(dev, idx, cmdq_pkt);
@@ -335,9 +360,12 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
addr += pending->pitch - 1;
}
+ if (ovl->data->supports_afbc)
+ mtk_ovl_set_afbc(ovl, cmdq_pkt, idx, is_afbc);
+
mtk_ddp_write_relaxed(cmdq_pkt, con, &ovl->cmdq_reg, ovl->regs,
DISP_REG_OVL_CON(idx));
- mtk_ddp_write_relaxed(cmdq_pkt, pitch, &ovl->cmdq_reg, ovl->regs,
+ mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb, &ovl->cmdq_reg, ovl->regs,
DISP_REG_OVL_PITCH(idx));
mtk_ddp_write_relaxed(cmdq_pkt, src_size, &ovl->cmdq_reg, ovl->regs,
DISP_REG_OVL_SRC_SIZE(idx));
@@ -346,6 +374,20 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
mtk_ddp_write_relaxed(cmdq_pkt, addr, &ovl->cmdq_reg, ovl->regs,
DISP_REG_OVL_ADDR(ovl, idx));
+ if (is_afbc) {
+ mtk_ddp_write_relaxed(cmdq_pkt, hdr_addr, &ovl->cmdq_reg, ovl->regs,
+ DISP_REG_OVL_HDR_ADDR(ovl, idx));
+ mtk_ddp_write_relaxed(cmdq_pkt,
+ OVL_PITCH_MSB_2ND_SUBBUF | overlay_pitch.split_pitch.msb,
+ &ovl->cmdq_reg, ovl->regs, DISP_REG_OVL_PITCH_MSB(idx));
+ mtk_ddp_write_relaxed(cmdq_pkt, hdr_pitch, &ovl->cmdq_reg, ovl->regs,
+ DISP_REG_OVL_HDR_PITCH(ovl, idx));
+ } else {
+ mtk_ddp_write_relaxed(cmdq_pkt,
+ overlay_pitch.split_pitch.msb,
+ &ovl->cmdq_reg, ovl->regs, DISP_REG_OVL_PITCH_MSB(idx));
+ }
+
mtk_ovl_layer_on(dev, idx, cmdq_pkt);
}
@@ -492,6 +534,15 @@ static const struct mtk_disp_ovl_data mt8192_ovl_2l_driver_data = {
.smi_id_en = true,
};
+static const struct mtk_disp_ovl_data mt8195_ovl_driver_data = {
+ .addr = DISP_REG_OVL_ADDR_MT8173,
+ .gmc_bits = 10,
+ .layer_nr = 4,
+ .fmt_rgb565_is_0 = true,
+ .smi_id_en = true,
+ .supports_afbc = true,
+};
+
static const struct of_device_id mtk_disp_ovl_driver_dt_match[] = {
{ .compatible = "mediatek,mt2701-disp-ovl",
.data = &mt2701_ovl_driver_data},
@@ -505,6 +556,8 @@ static const struct of_device_id mtk_disp_ovl_driver_dt_match[] = {
.data = &mt8192_ovl_driver_data},
{ .compatible = "mediatek,mt8192-disp-ovl-2l",
.data = &mt8192_ovl_2l_driver_data},
+ { .compatible = "mediatek,mt8195-disp-ovl",
+ .data = &mt8195_ovl_driver_data},
{},
};
MODULE_DEVICE_TABLE(of, mtk_disp_ovl_driver_dt_match);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
index 5c0d9ce69931..07092e27ff24 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -12,6 +12,7 @@
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_plane_helper.h>
+#include <linux/align.h>
#include "mtk_drm_crtc.h"
#include "mtk_drm_ddp_comp.h"
@@ -33,6 +34,14 @@ static const u32 formats[] = {
DRM_FORMAT_YUYV,
};
+static const u64 modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_BLOCK_SIZE_32x8 |
+ AFBC_FORMAT_MOD_SPLIT |
+ AFBC_FORMAT_MOD_SPARSE),
+ DRM_FORMAT_MOD_INVALID,
+};
+
static void mtk_plane_reset(struct drm_plane *plane)
{
struct mtk_plane_state *state;
@@ -52,6 +61,7 @@ static void mtk_plane_reset(struct drm_plane *plane)
state->base.plane = plane;
state->pending.format = DRM_FORMAT_RGB565;
+ state->pending.modifier = DRM_FORMAT_MOD_LINEAR;
}
static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
@@ -72,6 +82,32 @@ static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane
return &state->base;
}
+static bool mtk_plane_format_mod_supported(struct drm_plane *plane,
+ uint32_t format,
+ uint64_t modifier)
+{
+ if (modifier == DRM_FORMAT_MOD_LINEAR)
+ return true;
+
+ if (modifier != DRM_FORMAT_MOD_ARM_AFBC(
+ AFBC_FORMAT_MOD_BLOCK_SIZE_32x8 |
+ AFBC_FORMAT_MOD_SPLIT |
+ AFBC_FORMAT_MOD_SPARSE))
+ return false;
+
+ if (format != DRM_FORMAT_XRGB8888 &&
+ format != DRM_FORMAT_ARGB8888 &&
+ format != DRM_FORMAT_BGRX8888 &&
+ format != DRM_FORMAT_BGRA8888 &&
+ format != DRM_FORMAT_ABGR8888 &&
+ format != DRM_FORMAT_XBGR8888 &&
+ format != DRM_FORMAT_RGB888 &&
+ format != DRM_FORMAT_BGR888)
+ return false;
+
+ return true;
+}
+
static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
struct drm_plane_state *state)
{
@@ -120,21 +156,52 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
struct drm_gem_object *gem;
struct mtk_drm_gem_obj *mtk_gem;
unsigned int pitch, format;
+ u64 modifier;
dma_addr_t addr;
+ dma_addr_t hdr_addr = 0;
+ unsigned int hdr_pitch = 0;
gem = fb->obj[0];
mtk_gem = to_mtk_gem_obj(gem);
addr = mtk_gem->dma_addr;
pitch = fb->pitches[0];
format = fb->format->format;
+ modifier = fb->modifier;
- addr += (new_state->src.x1 >> 16) * fb->format->cpp[0];
- addr += (new_state->src.y1 >> 16) * pitch;
+ if (modifier == DRM_FORMAT_MOD_LINEAR) {
+ addr += (new_state->src.x1 >> 16) * fb->format->cpp[0];
+ addr += (new_state->src.y1 >> 16) * pitch;
+ } else {
+ int width_in_blocks = ALIGN(fb->width, AFBC_DATA_BLOCK_WIDTH)
+ / AFBC_DATA_BLOCK_WIDTH;
+ int height_in_blocks = ALIGN(fb->height, AFBC_DATA_BLOCK_HEIGHT)
+ / AFBC_DATA_BLOCK_HEIGHT;
+ int x_offset_in_blocks = (new_state->src.x1 >> 16) / AFBC_DATA_BLOCK_WIDTH;
+ int y_offset_in_blocks = (new_state->src.y1 >> 16) / AFBC_DATA_BLOCK_HEIGHT;
+ int hdr_size;
+
+ hdr_pitch = width_in_blocks * AFBC_HEADER_BLOCK_SIZE;
+ pitch = width_in_blocks * AFBC_DATA_BLOCK_WIDTH *
+ AFBC_DATA_BLOCK_HEIGHT * fb->format->cpp[0];
+
+ hdr_size = ALIGN(hdr_pitch * height_in_blocks, AFBC_HEADER_ALIGNMENT);
+
+ hdr_addr = addr + hdr_pitch * y_offset_in_blocks +
+ AFBC_HEADER_BLOCK_SIZE * x_offset_in_blocks;
+ /* The data plane is offset by 1 additional block. */
+ addr = addr + hdr_size +
+ pitch * y_offset_in_blocks +
+ AFBC_DATA_BLOCK_WIDTH * AFBC_DATA_BLOCK_HEIGHT *
+ fb->format->cpp[0] * (x_offset_in_blocks + 1);
+ }
mtk_plane_state->pending.enable = true;
mtk_plane_state->pending.pitch = pitch;
+ mtk_plane_state->pending.hdr_pitch = hdr_pitch;
mtk_plane_state->pending.format = format;
+ mtk_plane_state->pending.modifier = modifier;
mtk_plane_state->pending.addr = addr;
+ mtk_plane_state->pending.hdr_addr = hdr_addr;
mtk_plane_state->pending.x = new_state->dst.x1;
mtk_plane_state->pending.y = new_state->dst.y1;
mtk_plane_state->pending.width = drm_rect_width(&new_state->dst);
@@ -173,6 +240,7 @@ static const struct drm_plane_funcs mtk_plane_funcs = {
.reset = mtk_plane_reset,
.atomic_duplicate_state = mtk_plane_duplicate_state,
.atomic_destroy_state = mtk_drm_plane_destroy_state,
+ .format_mod_supported = mtk_plane_format_mod_supported,
};
static int mtk_plane_atomic_check(struct drm_plane *plane,
@@ -254,7 +322,7 @@ int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
err = drm_universal_plane_init(dev, plane, possible_crtcs,
&mtk_plane_funcs, formats,
- ARRAY_SIZE(formats), NULL, type, NULL);
+ ARRAY_SIZE(formats), modifiers, type, NULL);
if (err) {
DRM_ERROR("failed to initialize plane\n");
return err;
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.h b/drivers/gpu/drm/mediatek/mtk_drm_plane.h
index 2d5ec66e3df1..8f39011cdbfc 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.h
@@ -10,12 +10,20 @@
#include <drm/drm_crtc.h>
#include <linux/types.h>
+#define AFBC_DATA_BLOCK_WIDTH 32
+#define AFBC_DATA_BLOCK_HEIGHT 8
+#define AFBC_HEADER_BLOCK_SIZE 16
+#define AFBC_HEADER_ALIGNMENT 1024
+
struct mtk_plane_pending_state {
bool config;
bool enable;
dma_addr_t addr;
+ dma_addr_t hdr_addr;
unsigned int pitch;
+ unsigned int hdr_pitch;
unsigned int format;
+ unsigned long long modifier;
unsigned int x;
unsigned int y;
unsigned int width;
--
2.38.1.431.g37b22c650d-goog
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